/* 
 * Copyright 2004 The Apache Software Foundation 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 * http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */  
/* 
 * Original name : org.apache.webapp.admin.filters.SetCharacterEncodingFilter 
 * Modified by VirageGroup to match our needs. 
 */  
package com.swinginwind.core.filter;

import java.io.IOException;  

import javax.servlet.Filter;  
import javax.servlet.FilterChain;  
import javax.servlet.FilterConfig;  
import javax.servlet.ServletException;  
import javax.servlet.ServletRequest;  
import javax.servlet.ServletResponse;  
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;  

/** 
 * <p>Ce filtre permet de specifier des entetes HTTP dans la reponse.</p> 
 * 
 * <p>Il ajoute notemment le X-UA-Compatible pour Internet Explorer 8</p> 
 * 
 * <p>(http://www.jdocs.com/tomcat/5.5.17/org/apache/webapp/admin/filters/SetCharacterEncodingFilter.html)<br/> 
 * Filter that sets the character encoding to be used in parsing the 
 * incoming request, either unconditionally or only if the client did not 
 * specify a character encoding. Configuration of this filter is based on 
 * the following initialization parameters: 
 * <ul> 
 * <li><strong>encoding</strong> - The character encoding to be configured 
 * for this request, either conditionally or unconditionally based on 
 * the <code>ignore</code> initialization parameter. This parameter 
 * is required, so there is no default.</li> 
 * <li><strong>ignore</strong> - If set to "true", any character encoding 
 * specified by the client is ignored, and the value returned by the 
 * <code>selectEncoding()</code> method is set. If set to "false, 
 * <code>selectEncoding()</code> is called <strong>only</strong> if the 
 * client has not already specified an encoding. By default, this 
 * parameter is set to "true".</li> 
 * </ul> 
 * </p> 
 */  
public class SetHttpHeadersFilter implements Filter {  
	/** 
	 * The filter configuration object we are associated with. If this value 
	 * is null, this filter instance is not currently configured. 
	 */  
	protected FilterConfig filterConfig = null;  

	/** 
	 * Should a character encoding specified by the client be ignored? 
	 */  
	protected boolean ignore = false;  
	
	private String uaCompatible = "";

	// --------------------------------------------------------- Public Methods  

	/** 
	 * Take this filter out of service. 
	 */  
	public void destroy() {  
		this.filterConfig = null;  

	}  

	/** 
	 * Select and set (if specified) the character encoding to be used to 
	 * interpret request parameters for this request. 
	 * 
	 * @param request The servlet request we are processing 
	 * @param response The servlet response we are creating 
	 * @param chain The filter chain we are processing 
	 * 
	 * @exception IOException if an input/output error occurs 
	 * @exception ServletException if a servlet error occurs 
	 */  
	public void doFilter(ServletRequest request, ServletResponse response,  
			FilterChain chain)  
					throws IOException, ServletException {  
		//ajout du X-UA-Compatible pour IE8+ //TODO rendre ca configurable...  
		//ou "IE=8;FF=3;Opera=10;Chrome=2;Safari=4;OtherUA=4" ou "IE=edge;OtherUA=edge"  
		//aussi present dans /inc/head.inc.jsp  
		if(!this.ignore)
			((HttpServletResponse)response).setHeader("X-UA-Compatible", uaCompatible);  
		System.out.print(((HttpServletRequest)request).getHeader("User-Agent"));
		// Pass control on to the next filter  
		chain.doFilter(request, response);  
	}  

	/** 
	 * Place this filter into service. 
	 * 
	 * @param filterConfig The filter configuration object 
	 */  
	public void init(FilterConfig filterConfig) throws ServletException {  
		this.filterConfig = filterConfig;  

		this.uaCompatible = filterConfig.getInitParameter("X-UA-Compatible");  

		String value = filterConfig.getInitParameter("ignore");  
		this.ignore = value != null && value.equalsIgnoreCase("true");
	}

	/**
	 * @return the uaCompatible
	 */
	public String getUaCompatible() {
		return uaCompatible;
	}

	/**
	 * @param uaCompatible the uaCompatible to set
	 */
	public void setUaCompatible(String uaCompatible) {
		this.uaCompatible = uaCompatible;
	}  

	// ------------------------------------------------------ Protected Methods  
}  